Photophysical investigation of a donor-acceptor based Schiff base in solvents of varying polarities

Nath, Surjatapa; Bhattacharya, Barnali; Sarkar, Utpal; Singh, T. Sanjoy

doi:10.1016/j.molstruc.2022.132435

Cited by 8 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These polarity-induced red shifts indicated the preferential stabilization of the polar excited states of the compounds in these solvents. 14 However, in polar protic solvents like MeOH and EtOH, the absorption spectra were broader with noticeable hypochromism, possibly due to the hydrogen bonding interaction of the benzimidazole –NH protons with solvent molecules. 15 In the same solvent, the absorption maxima of compound 2 ( meta isomer) were found to be blue-shifted (approximately 10 nm) compared to those of 1 and 3 .…”

Section: Resultsmentioning

confidence: 99%

Tuning sensing efficacy of anthraimidazoledione-based charge transfer dyes: nitro group positioning impact

Chettri,

Pal,

Jha

et al. 2024

Dalton Trans.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Tuning sensing efficacy of anthraimidazoledione-based charge transfer dyes: nitro group positioning impact

Chettri,

Pal,

Jha

et al. 2024

Dalton Trans.

View full text Add to dashboard Cite

show abstract

“…However, we preliminarily confirmed the presence of NH protons by FT-IR, and the final confirmation was done with HRMS (ESI) data: calculated for C 18 H 13 N 3 S 3 (M + H) 367.0360, found 368.0367 (Figure S2b). 13 S2c).…”

Section: Real-time Sample Analysismentioning

confidence: 95%

“…Several compounds in the reported literature were considering just a single wavelength either quenched or enhanced. − To the best of the author’s knowledge, L2 is the first compound of its kind of simple conjugated thiophene-appended benzothiazole moiety for the ratiometric detection of metal ions. , Because ratiometric detection simultaneously measures the ratio of two emission bands, , it can exclude the distortion from the external environment and produce results that are more pronounced than intensity-based measurement.…”

Section: Introductionmentioning

confidence: 99%

Thiophene-Appended Benzothiazole Compounds for Ratiometric Detection of Copper and Cadmium Ions with Comparative Density Functional Theory Studies and Their Application in Real-Time Samples

Purushothaman

Karpagam

2022

ACS Omega

View full text Add to dashboard Cite

A thirst for the development of a simple fluorescence probe for enhanced sensing application has been achieved by synthesizing a stupendous thiophene-appended benzothiazole-conjugated compound L2. The synthesized compound L2 was characterized using nuclear magnetic resonance and mass spectrometry techniques. Furthermore, a photophysical property of L1 and L2 reveals the enhanced emission spectrum of L2 because of a restricted spin–orbital coupling as a result of increased conjugation compared to the ligand L1. Therefore, comparative studies were undertaken for L1 and L2. Henceforth, L2 was deployed for the ratiometric detection of Cd2+ ions in THF:water and L1 for the detection of Cu2+ ions in THF medium. The chemosensor L2 shows an outstanding water tolerance up to 60% and is stable between pH 2 and 7. This level of water tolerance and stability make L2 a suitable probe for analyzing real-time and biological samples. While the cadmium ion was added to L2, there was a significant red shift in emission from 496 to 549 nm, which indicates the controlled ICT due to complex formation. The metal–ligand complexation was also confirmed by noticing a decreased band gap of metal complex compared to the ligand as calculated using Tauc’s plot with solid-phase UV data. The stoichiometric ratio was obtained by Job’s plot that exhibited a 1:1 ratio of L2 and Cd2+ ions, and the limit of detection (LOD) was found to be 2.25 nM by the photoluminescence spectroscopic technique. The fluorescence lifetime of both L2 and L2-Cd2+ was found to be 58.3 ps and 0.147 ns, respectively. Alongside, the colorimetric-assisted ratiometric detection of Cu2+ by L1 with 1:2 stoichiometric ratio having an LOD of 1.06 × 10–7 M was also performed. Furthermore, the practical applicability of the probe L2 in sensing cadmium was tested in sewage water and vegetable extract; the recovery was approximately 98 and 99%, respectively. The experimental data were supported by theoretical investigation of structures of L1, L2, L1-Cu2+ , and L2-Cd2+ , complex formation, charge transfer mechanism, and band gap measurements done by quantum chemical density functional theory calculations.

show abstract

“…These molecules display unique optical and spectral characteristics. The importance of these molecules is shown by the appearance of large Variations in photophysical characteristics and redshifts in emission spectra in response to rising solvent polarity [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

Gawad,

Ghazy,

Mansour

et al. 2024

J Fluoresc

View full text Add to dashboard Cite

This work explores the effects of solvent polarity on Janus Green B (JGB) photophysical properties. The Lippert-Mataga, Billot, and Ravi equations were utilized to calculate the singlet-state excited dipole moments (µe) and ground state dipole moments (µg) using absorption and fluorescence spectra analyses. The results showed an increase in the former, which is suggestive of electronic structural alterations upon excitation. Analysis of fluorescence quantum yield values revealed that JGB’s environment had an impact on its emission characteristics; it was particularly sensitive to silver nanoparticles, suggesting possible interactions. While simulations of electron density, electrostatic potential, and energy gap (Eg) helped to understand the electronic structure of JGB, theoretical absorption spectra produced by Time Dependent Density Function Theory (TD-DFT) calculations offered insights into electronic transitions during absorption. To sum up, the present study contributes to our comprehension of the molecular behavior of JGB in various solvents by elucidating the intricate relationship among solvent polarity, molecular environment, and interactions with silver nanoparticles. Additionally, theoretical computations support the interpretation of experimental results.

show abstract

Photophysical investigation of a donor-acceptor based Schiff base in solvents of varying polarities

Cited by 8 publications

References 42 publications

Tuning sensing efficacy of anthraimidazoledione-based charge transfer dyes: nitro group positioning impact

Tuning sensing efficacy of anthraimidazoledione-based charge transfer dyes: nitro group positioning impact

Thiophene-Appended Benzothiazole Compounds for Ratiometric Detection of Copper and Cadmium Ions with Comparative Density Functional Theory Studies and Their Application in Real-Time Samples

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

Contact Info

Product

Resources

About